Question

please help me in this​

Answer 1

1.) (c)blue

2.) (d)small bubbles of H2 gas appear on the surface of zinc piece.

3.) (b)3

4.) (b)hydrated ferric oxide

Answer 2

Answer:

(i) blue

(ii)Small bubbles of hydrogen gas appear on the surface of zinc pieces

(iii) 4 molecules

(iv) hydrated ferric oxide

Explanation:

(i)If some of the crystals of anhydrous copper sulfate are dissolved in water the resultant colour of the solution is blue or some times sky blue.

The solution turns acidic.

The reaction in an endothermic reaction.

(ii) This is a single displacement reaction. Zinc being more reactive than hydrogen displaces hydrogen from its solution and forms zinc chloride which is white in color and liberates hydrogen gas which is a odorless gas.

(iii) After balancing we get

3PbS + 4O3=3PbSO4

So in every 3 molecules of PbS we require 4 molecules of ozone

(iv) Chemical formula of rust is Hydrated Ferric oxide